Making hard-rubber balls.



, MARTIN E. FISHER, OF MINERAL CITY, OHIO.

MAKING HARD-RUBBER BALLS.

Specification of Letters Patent.

Application filed April 26, 1905. Serial No. 257,396.

To all whom it may concern:

Be it known that I, MARTIN E. FISHER, a citizen of the United States,residing at Mineral City, in the county of Tuscarawas and State of Ohio,have invented a new and riseful Im rovement in Making Hard-Rubber IBalls, which the following is a specification.

The invention relates to the making of a hard-rubber ball for bowling orother similar purposes; and the object of the improvement is to make astrong, durable, and resilient ball of ro er weight. and; suitable colorwhich H1 ta e and keep a good polish and which will remain in a givenposition on a level surface even though finger-holes are provided in oneside. I

The ball is made of a relatively dense and heavy central part or core,with a more resilient and lighter outer or peripheral part. The centralcore is com osed of two parts caoutchouc or india-rub er,preferably,Para; two

parts coal-flour, preferably cannel; one part sulfur-flour, preferablygolden, and three ing gives this part the'desir'ed greater density andweight, and the presence of the coal-flour in the composition givestheball a jet-black color and enables it to be highly polishedt -"It hasbeenfound empirically that a ball so .made will remain quiescent in anygiven position on a level'surface even though finger-1 holes areprovided in one side thereof.

It is not essential that the prevulcanized core for the ball shall bemade of the composition herein specified, for the well-known mixturesof'india-rubber with sawdust, pulp, fiber, asbestos, and the like forvulcanizing can be used for this purpose; nor is it essen- 7o tial thatthe ingredients of the com ositions herein described must be used in t eexact proportions as stated, although the same ave been found to givegood rr ults.

The coal-flour used in the composition of this ball is preferably madeby crushing ordinary cannel-coal, then grinding it between corrugatedrolls, then powdering it between smooth rolls, and then bolting itthrough a Patented Jan. 23,1906.

screen of about one hundred and forty mesh, 8 and the sulfur-flour is anordinary article of commerce, and the particular brand known to thetrade as golden sulfur floured is 1 preferably used. The hard-rubberball thus made, which is described, but not claimed erein, will be madethe subject-matter of an-, other application for Letters Patent. What Iclaim as my invention, and desire to secure by Letters Patent, s-- l 1.The process of -makin;' a hard-rubber on parts talcowder. The caoutchoucor indiarubber is st thoroughly masticated in the usual manner, as byassing it between serrated rolls. The coal and sulfur flours and thetalc-powder are then thoroughly mixed with the masticated rubber, as bymilling with hot rolls, during which milling the flours and powder areradually applied to and worked into the ru ber. A core-ball say of fourand one-half inchesindiameteris made of this composition byforming andcompressmg the same in a mold and therein vulcanizing it under highpressure for some three hours at about 300 Fahrenheit. The peripheralpart is made of the same composition Without the talc-powderthat is tosay, it is composed of two parts caoutchouc or india-rubber, preferablyPara; two parts coalflour, preferably cannel, and one part sulfurflour,preferably golden.

The caoutchouc or india-rubber is masticated, and the coal and sulfurflours are then mixed by milling in the same manner as described for thecore composition. The peripheral composition isthen' molded around thevulcanized core-ball as a center to make a finished ball of, say, nineinches in diameter, which same is then vulcanized in the usualmannerthat is to say, in a mold without any special pressurebeing'applied thereto be-' yondthat required for the mere molding. Theuse of tale for the core-ball and the greater pressure applied theretoin vulcanizball consisting inmasticating a e parts india- I rubber andhot-milling the] vith two partsv coal-flour, one part sulfurtour andthree par talc-powder, then molding and vulcanizin; under high pressurea core-ball of this 5 composition and then molding on the core-ball as acenter and vulcanizing under low pressure a larger ball of the samecomposition, less the tale.

2. The process of making a hard-rubber 10o ball consisting in. mixingindie-rubber with coal-flour, sulfur-flour and talc-powder, and

molding and vulcanizing under high pressure a core-ball of thiscomposition, then molding onthe core-ball as a center and vulcanizingr05 under low pressure a larger ball of the same composition, less thetale.

3. The process of makinga hard-rubber hall consisting in mixingindiarubber with coal-flour, sulfur-flour and talepowder and molding andvulcanizing under high pressure a core-ball of-tlns composition, an thenincid- L ng-Ion the core-bell as e center elerger ball of inunderhigh'pressure ber composition, and then molding on the core-ball asa center and vul'oanizi'ngnnder low pressure a larger bell of acomposition made by so and sulfur-flour.

' 5. The process of bell-eo mixing indie-rubber with 'eoel-flour,

herd-rubber making a herd-rubber nsisting in molding and jrmloanizingber composition, and then molding on the core-bell .es a center andvulcanizing under low pressure a larger bell-of a similar composition;In testimony whereof I heve'signedmy name to this'speoifioetion in thepresence of tWo subscribing Witnesses.

MARTIN FISHER. Witnesses: f H'ARRY'FREASE,-

CMINNIE F. ANTHONY.

